package com.jerry.usbserial.util

import okhttp3.internal.and

/**
 * Created by dugang on 2020/6/13.
 */
object CRCUtil {
    private val table = intArrayOf(
        0x00000000, 0x77073096, -0x11f19ed4, -0x66f6ae46, 0x076dc419, 0x706af48f, -0x169c5acb, -0x619b6a5d,
        0x0edb8832, 0x79dcb8a4, -0x1f2a16e2, -0x682d2678, 0x09b64c2b, 0x7eb17cbd, -0x1847d2f9, -0x6f40e26f,
        0x1db71064, 0x6ab020f2, -0xc468eb8, -0x7b41be22, 0x1adad47d, 0x6ddde4eb, -0xb2b4aaf, -0x7c2c7a39,
        0x136c9856, 0x646ba8c0, -0x29d0686, -0x759a3614, 0x14015c4f, 0x63066cd9, -0x5f0c29d, -0x72f7f20b,
        0x3b6e20c8, 0x4c69105e, -0x2a9fbe1c, -0x5d988e8e, 0x3c03e4d1, 0x4b04d447, -0x2df27a03, -0x5af54a95,
        0x35b5a8fa, 0x42b2986c, -0x2444362a, -0x534306c0, 0x32d86ce3, 0x45df5c75, -0x2329f231, -0x542ec2a7,
        0x26d930ac, 0x51de003a, -0x3728ae80, -0x402f9eea, 0x21b4f4b5, 0x56b3c423, -0x30456a67, -0x47425af1,
        0x2802b89e, 0x5f058808, -0x39f3264e, -0x4ef416dc, 0x2f6f7c87, 0x58684c11, -0x3e9ee255, -0x4999d2c3,
        0x76dc4190, 0x01db7106, -0x672ddf44, -0x102aefd6, 0x71b18589, 0x06b6b51f, -0x60401b5b, -0x17472bcd,
        0x7807c9a2, 0x0f00f934, -0x69f65772, -0x1ef167e8, 0x7f6a0dbb, 0x086d3d2d, -0x6e9b9369, -0x199ca3ff,
        0x6b6b51f4, 0x1c6c6162, -0x7a9acf28, -0xd9dffb2, 0x6c0695ed, 0x1b01a57b, -0x7df70b3f, -0xaf03ba9,
        0x65b0d9c6, 0x12b7e950, -0x74414716, -0x3467784, 0x62dd1ddf, 0x15da2d49, -0x732c830d, -0x42bb39b,
        0x4db26158, 0x3ab551ce, -0x5c43ff8c, -0x2b44cf1e, 0x4adfa541, 0x3dd895d7, -0x5b2e3b93, -0x2c290b05,
        0x4369e96a, 0x346ed9fc, -0x529877ba, -0x259f4730, 0x44042d73, 0x33031de5, -0x55f5b3a1, -0x22f28337,
        0x5005713c, 0x270241aa, -0x41f4eff0, -0x36f3df7a, 0x5768b525, 0x206f85b3, -0x46992bf7, -0x319e1b61,
        0x5edef90e, 0x29d9c998, -0x4f2f67de, -0x3828574c, 0x59b33d17, 0x2eb40d81, -0x4842a3c5, -0x3f459353,
        -0x12477ce0, -0x65404c4a, 0x03b6e20c, 0x74b1d29a, -0x152ab8c7, -0x622d8851, 0x04db2615, 0x73dc1683,
        -0x1c9cf4ee, -0x6b9bc47c, 0x0d6d6a3e, 0x7a6a5aa8, -0x1bf130f5, -0x6cf60063, 0x0a00ae27, 0x7d079eb1,
        -0xff06cbc, -0x78f75c2e, 0x1e01f268, 0x6906c2fe, -0x89da8a3, -0x7f9a9835, 0x196c3671, 0x6e6b06e7,
        -0x12be48a, -0x762cd420, 0x10da7a5a, 0x67dd4acc, -0x6462091, -0x71411007, 0x17b7be43, 0x60b08ed5,
        -0x29295c18, -0x5e2e6c82, 0x38d8c2c4, 0x4fdff252, -0x2e44980f, -0x5943a899, 0x3fb506dd, 0x48b2364b,
        -0x27f2d426, -0x50f5e4b4, 0x36034af6, 0x41047a60, -0x209f103d, -0x579820ab, 0x316e8eef, 0x4669be79,
        -0x349e4c74, -0x43997ce6, 0x256fd2a0, 0x5268e236, -0x33f3886b, -0x44f4b8fd, 0x220216b9, 0x5505262f,
        -0x3a45c442, -0x4d42f4d8, 0x2bb45a92, 0x5cb36a04, -0x3d280059, -0x4a2f30cf, 0x2cd99e8b, 0x5bdeae1d,
        -0x649b3d50, -0x139c0dda, 0x756aa39c, 0x026d930a, -0x63f6f957, -0x14f1c9c1, 0x72076785, 0x05005713,
        -0x6a40b57e, -0x1d4785ec, 0x7bb12bae, 0x0cb61b38, -0x6d2d7165, -0x1a2a41f3, 0x7cdcefb7, 0x0bdbdf21,
        -0x792c2d2c, -0xe2b1dbe, 0x68ddb3f8, 0x1fda836e, -0x7e41e933, -0x946d9a5, 0x6fb077e1, 0x18b74777,
        -0x77f7a51a, -0xf09590, 0x66063bca, 0x11010b5c, -0x709a6101, -0x79d5197, 0x616bffd3, 0x166ccf45,
        -0x5ff51d88, -0x28f22d12, 0x4e048354, 0x3903b3c2, -0x5898d99f, -0x2f9fe909, 0x4969474d, 0x3e6e77db,
        -0x512e95b6, -0x2629a524, 0x40df0b66, 0x37d83bf0, -0x564351ad, -0x2144613b, 0x47b2cf7f, 0x30b5ffe9,
        -0x42420de4, -0x35453d76, 0x53b39330, 0x24b4a3a6, -0x452fc9fb, -0x3228f96d, 0x54de5729, 0x23d967bf,
        -0x4c9985d2, -0x3b9eb548, 0x5d681b02, 0x2a6f2b94, -0x4bf441c9, -0x3cf3715f, 0x5a05df1b, 0x2d02ef8d
    )

    fun getCrc32(bytes: ByteArray): ByteArray {
        var crc = 0
        for (b in bytes) {
            crc = crc ushr 8 xor table[crc xor b.toInt() and 0xff]
        }
        return crc.to4LByteArray()
    }

    fun checkCrc32(bytes: ByteArray): Boolean {
        if (bytes.size <= 4) return false
        val crc = bytes.copyOfRange(bytes.size - 4, bytes.size)
        val data = bytes.copyOfRange(0, bytes.size - 4)
        return getCrc32(data).contentEquals(crc)
    }

    fun getCrc16(bytes: ByteArray, length: Int): Int {
        var crc = 0
        var i: Int
        var j = 0
        var len = length
        while (len-- != 0) {
            i = 0x80
            while (i != 0) {
                crc *= 2
                if (crc and 0x10000 != 0) crc = crc xor 0x11021
                if ((bytes[j] and i) != 0) crc = crc xor 0x1021
                i /= 2
            }
            j++
        }
        return crc
    }


}